Hello,
I've added a new driver to the cairo family that lets you draw into a
"external" cairo context (v8362). It is the same idea as Jonathan's
extension to xcairo driver to allow the use of external XDrawables.
Hopefully this will (also) be useful for integrating PLplot into
larger GUI based applications that are handling their own windows.
Notes:
(1) The cairoContext is currently not cleared by PLplot prior to
plotting.
(2) I don't think you can query the size of a cairo context, so in
general you'd also need to tell PLplot the size of the graph that you
wanted.
-Hazen
A trivial example:
#include <stdio.h>
#include <cairo.h>
#include <cairo-ps.h>
#include <plplot.h>
int main(int argc, char *argv[])
{
cairo_surface_t *cairoSurface;
cairo_t *cairoContext;
cairoSurface = cairo_ps_surface_create("test.ps", 720, 540);
cairoContext = cairo_create(cairoSurface);
plsdev("extcairo");
plinit();
pl_cmd(PLESC_DEVINIT, cairoContext);
plenv(0.0, 1.0, 0.0, 1.0, 1, 0);
pllab("x", "y", "title");
plend();
cairo_destroy(cairoContext);
cairo_surface_destroy(cairoSurface);
}
Compile with:
gcc ext-cairo-test.c -o ext-cairo-test `pkg-config --cflags --libs
plplotd cairo`
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